A more striking illustration of the action of carbohydrate in sparing proteid is seen in experiments on man, where the nitrogen intake is reduced to a minimum, so as to constitute a condition of specific nitrogen-hunger. In such a case, increasing amounts of carbohydrate added to the intake reduce enormously the using up of tissue proteid. The following experiment with a young man 22 years old and 71.3 kilos body-weight, reported by Landergren,[29] affords good evidence of the extent to which this proteid sparing power may manifest itself. [29] Landergren: Untersuchungen über die Eiweissumsetzung des Menschen, Skandinavisches Archiv für Physiologie, Band 14, p. 114. We see here the nitrogen consumption fall to the exceedingly low level of 3.34 grams per day, or 0.047 gram per kilo of body-weight. To appreciate the full significance of this drop in the extent of proteid metabolism, we may recall that Succi, with a body-weight of only 62.4 kilos, on the seventh day of fasting excreted 9.4 grams of nitrogen, corresponding to a metabolism of 58.7 grams of tissue proteid. In other words, with an intake of only 5.6 grams of proteid, the addition of 908 grams of carbohydrate, with a total fuel value of 3745 calories, reduced the consumption of tissue proteid to 20.8 grams. The same individual, if fasting, would undoubtedly have used up at least 70 grams of tissue proteid. +----+------------------------------------------++---------++------------+ | | Intake. || Output. || | |Day.+--------+-----+--------+--------+---------++---------++ Proteid | | |Proteid.| Fat.| Carbo- |Alcohol.|Calories.||Nitrogen ||metabolized.| | | | |hydrate.| | ||of Urine.|| | +----+--------+-----+--------+--------+---------++---------++------------+ | | grams |grams| grams | grams | || grams || grams | | 1 | 35.2 | 6.1 | 507 | 26.6 | 2465.9 || 12.16 || 76.0 | | 2 | 28.7 | 4.7 | 787 | 26.6 | 3574.3 || 8.37 || 52.3 | | 3 | 28.8 | 4.7 | 841 | 26.6 | 3796.1 || 5.02 || 31.3 | | 4 | 28.3 | 4.9 | 839 | 13.3 | 3690.5 || 4.50 || 28.1 | | 5 | 5.4 | .. | 898 | .... | 3703.9 || 4.01 || 25.0 | | 6 | 6.0 | .. | 931 | .... | 3841.7 || 3.36 || 21.0 | | 7 | 5.6 | .. | 908 | .... | 3745.8 || 3.34 || 20.8 | +----+--------+-----+--------+--------+---------++---------++------------+